#include <kernel/types.h>
#include <user/user.h>
#include <kernel/stat.h>

int main(int argc,char *argv[])
{
   if(argc != 2) 
   {
        printf("lack of input!\n");
        exit(-1);
   }
   else
   {
        int tick = atoi(argv[1]);
        sleep(tick);
        
        exit(0);
   }
}